The guy who said I was referring to "spoilerons" was exactly correct in the naming of the control function, but unlike him, I guarantee it will slow the plane down. Mixing in elevator is just for people who don't feel like holding a lot of up elevator once they are engaged. A "brief" explanation about why it slows the plane down: the angle of attack is defined as the angle between the airstream and the line drawn between the leading and trailing edge of the wing. When spoilers are engaged it severely reduces the angle of attack, forcing the nose of the aiplane to be raised in order to maintain an angle of attack that will support straight and level flight. This nose-high attitude causes more of the bottom of the lifting surfaces to be exposed to the airstream, thus increasing drag (and reducing airspeed). One of the difficulties when first using the spoilers is getting used to the plane flying that slow with such a pronounced nose-high attitude. Notice here, I did not say high angle of attack, because the angle of attack has not changed that much, if at all. Think of it like this... have you ever seen a military jet coming in for a landing? They do that because the airframe of the plane becomes it's own built-in air brake. You can force the same out of any plane you have that is designed to cut through the air if you use spoilers.